Turns a 3.5mm audio output port into two distinct ports: one headphone port and one microphone port Headset adapter for headsets with separate headphone and microphone plugs / 3.5mm 4 pin to 2x3 pin 3.5mm Connect a headset equipped with separate headphone and microphone plugs to the audio port on your laptop or your phone or your tablet Connect an external microphone and powered speakers to the audio port on your laptop